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Hi Axel,
I definitely should join next PoG meeting to discuss everything at once. Unfortunately today I couldn't make it.
I think I will try your suggestions on the real computational experiment already.
I agree with you that LWFA example is a completely unphysical situation. However my idea was that for a symmetrical filed on a uniform symmetrical grid the picture should be a the same in either direction (no matter if it is physically correct or not). Let us see if the situation will change for a realistic pulse.
Regarding the borders can you advice some distance to the edge which is OK? :) I guess plasma wavelength from the edge of the field to the border of the computational domain should be big enough?
Best,
Danila.
-----Original Message-----
From: picongpu-users@hzdr.de [mailto:picongpu-users@hzdr.de] On Behalf Of Axel Huebl
Sent: Friday, January 13, 2017 5:01 PM
To: picongpu-users@hzdr.de
Subject: Re: [PIConGPU-Users] [PIConGPU-Users] Electron density asymmetry
Hi Danila,
the LWFA example is a bit rought, too close to the border, has a unrealistic few-cycle laser pulse (5fs!), etc., which can heavily influence the formation of the bubble. But still:
what you see is a rather random snapshot from some plane position at some random time of the wake. To get a better picture, read the density from the HDF5 output and vary the plane along y. Also, better take a longer pulse.
Does that result in a more physical picture then? :)
Best,
Axel
On 13.01.2017 16:46, Khikhlukha Danila wrote:
> Dear all,
> I've noticed a strange electron density asymmetry on the pictures
> provided by the pngModule.
>
> As an example I'm using PoG 0.2.1 standard LWFA example with all
> default settings. The computational grid is specified like
> `TBG_gridSize="-g
> 128 256 128"` with no moving window. I have noticed that the shape of
> the wake wave is not circular in the transversal direction. Please
> find a picture attached to illustrate the issue.
> It looks a bit strange to me as the laser pulse has a circular
> polarization and grid size/step are the same in both transversal
> directions. This "rectangular" shape of the wake wave puzzles me a bit...
>
> Best regards,
> Danila.
>
>
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--
Axel Huebl
Phone +49 351 260 3582
https://www.hzdr.de/crp
Computational Radiation Physics
Laser Particle Acceleration Division
Helmholtz-Zentrum Dresden - Rossendorf e.V.
Bautzner Landstrasse 400, 01328 Dresden
POB 510119, D-01314 Dresden
Vorstand: Prof. Dr.Dr.h.c. R. Sauerbrey
Prof. Dr.Dr.h.c. P. Joehnk
VR 1693 beim Amtsgericht Dresden
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